package com.ms.user.util;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Random;
import java.util.UUID;

public class ImageCaptchaUtil {



    // 验证码源
    private static final String CAPTCHA = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    // 高度
    private static final int HEIGHT = 60;
    // 宽度
    private static final int WIDTH = 150;
    // 字体
    private static final String FONT = "Ayuthaya";
    private static Random random = new Random();

    public static class ImageCaptcha {
        // 验证码
        private String captcha;
        // 图片
        private byte[] imageCaptcha;

        public ImageCaptcha(String captcha, byte[] imageCaptcha) {
            this.imageCaptcha = imageCaptcha;
            this.captcha = captcha;
        }

        public String getCaptcha() {
            return captcha;
        }

        public void setCaptcha(String captcha) {
            this.captcha = captcha;
        }

        public byte[] getImageCaptcha() {
            return imageCaptcha;
        }

        public void setImageCaptcha(byte[] imageCaptcha) {
            this.imageCaptcha = imageCaptcha;
        }
    }

    /**
     * 获取指定长度验证码
     */
    public static String getCaptcha(int charCount) {
        return getCaptcha(charCount, CAPTCHA);
    }

    /**
     * 按照源随机获取指定长度验证码
     *
     * @param charCount 验证码长度
     * @param source    验证码源字符串
     */
    public static String getCaptcha(int charCount, String source) {
        if (source == null || source.length() == 0) {
            source = CAPTCHA;
        }
        Random random = new Random(System.currentTimeMillis());
        StringBuffer buffer = new StringBuffer(charCount);
        for (int i = 0; i < charCount; i++) {
            buffer.append(source.charAt(random.nextInt(source.length() - 1)));
        }
        return buffer.toString();
    }

    /**
     * 输出随机验证码图片流,并返回验证码值
     */
    public static ImageCaptcha getImageCaptcha(int charCount) {
        return getImageCaptcha(WIDTH, HEIGHT, charCount);
    }

    /**
     * 输出随机验证码图片流,并返回验证码值
     */
    public static ImageCaptcha getImageCaptcha(int w, int h, int charCount) {
        String captcha = getCaptcha(charCount);
        byte[] imageCaptcha = outputImage(w, h, captcha);
        return new ImageCaptcha(captcha, imageCaptcha);
    }

    /**
     * 输出指定验证码图片流
     */
    public static byte[] outputImage(int w, int h, String captcha) {
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Random rand = new Random();
        Graphics2D g2 = image.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Color[] colors = new Color[5];
        Color[] colorSpaces = new Color[]{Color.WHITE, Color.CYAN,
                Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
                Color.PINK, Color.YELLOW};
        float[] fractions = new float[colors.length];
        for (int i = 0; i < colors.length; i++) {
            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
            fractions[i] = rand.nextFloat();
        }
        Arrays.sort(fractions);

        g2.setColor(Color.GRAY);// 设置边框色
        g2.fillRect(0, 0, w, h);

        Color c = getRandColor(200, 250);
        g2.setColor(c);// 设置背景色
        g2.fillRect(0, 2, w, h - 4);

        //绘制干扰线
        g2.setColor(getRandColor(160, 200));// 设置线条的颜色
        for (int i = 0; i < 20; i++) {
            int x = random.nextInt(w - 1);
            int y = random.nextInt(h - 1);
            int xl = random.nextInt(6) + 1;
            int yl = random.nextInt(12) + 1;
            g2.drawLine(x, y, x + xl + 40, y + yl + 20);
        }

        // 添加噪点
        float yawpRate = 0.05f;// 噪声率
        int area = (int) (yawpRate * w * h);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(w);
            int y = random.nextInt(h);
            int rgb = getRandomIntColor();
            image.setRGB(x, y, rgb);
        }

        shear(g2, w, h, c);// 使图片扭曲

        g2.setColor(getRandColor(100, 160));
        int fontSize = h - 4;
        Font font = new Font(FONT, Font.ITALIC, fontSize);
        g2.setFont(font);
        char[] chars = captcha.toCharArray();
        int length = captcha.length();
        for (int i = 0; i < captcha.length(); i++) {
            AffineTransform affine = new AffineTransform();
            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), ((double) w / length) * i + (double) fontSize / 2, (double) h / 2);
            g2.setTransform(affine);
            g2.drawChars(chars, i, 1, ((w - 10) / length) * i + 5, h / 2 + fontSize / 2 - 10);
        }

        g2.dispose();
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            ImageIO.write(image, "png", baos);
            return baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    private static Color getRandColor(int fc, int bc) {
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    private static int getRandomIntColor() {
        int[] rgb = getRandomRgb();
        int color = 0;
        for (int c : rgb) {
            color = color << 8;
            color = color | c;
        }
        return color;
    }

    private static int[] getRandomRgb() {
        int[] rgb = new int[3];
        for (int i = 0; i < 3; i++) {
            rgb[i] = random.nextInt(255);
        }
        return rgb;
    }

    private static void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }

    private static void shearX(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(2);

        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);

        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }

    }

    private static void shearY(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(40) + 10; // 50;

        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }

        }
    }

    public static void main(String[] args) throws IOException {
        ImageCaptcha imageCaptcha = ImageCaptchaUtil.getImageCaptcha(5);
        System.out.println("验证码：" + imageCaptcha.getCaptcha());
        FileOutputStream outputStream = new FileOutputStream(new File("1.png"));
        outputStream.write(imageCaptcha.getImageCaptcha());
    }
    //获取验证码路径和值
    public static HashMap<String, String> getImageCode() {
        try {
            //验证码的值
            ImageCaptcha imageCaptcha = ImageCaptchaUtil.getImageCaptcha(5);
            String captcha = imageCaptcha.getCaptcha();
            System.out.println("验证码：" + captcha);
            //验证码的存储路径
            String s = UUID.randomUUID().toString();
            FileOutputStream outputStream = new FileOutputStream(new File("E:\\资料coreJava\\1906a\\miaosha\\admin\\src\\main\\imgyzm\\"+s+".png"));
            outputStream.write(imageCaptcha.getImageCaptcha());
            HashMap<String, String> map = new HashMap<>();
            map.put("url","E:\\资料coreJava\\1906a\\miaosha\\admin\\src\\main\\imgyzm\\"+s+".png");
            map.put("code",captcha);
            return map;
        }catch (Exception e){
            e.printStackTrace();
            return null;
        }

    }

}
